Experimental Investigationson Air-Cooled Diesel Engine with Biodiesels asAlternateFuels

Document Type : Primary Research paper

Authors

1 Assistant Professor, Department of Automobile Engineering,

2 Assistant Professor, Department of Mechanical Engineering, Nehru Institute of Technology,Coimbatore – 641 105

Abstract

Biodiesels of simarouba, rubber
seed and rice bran were produced from
their respective feed stocks by
transesterificationprocessandtestedinanairco
oleddieselengineasasubstitutefuels.Theexpe
rimentalinvestigationaims in accessibility
of using neat biodiesels in anunmodified
stationery diesel engine meant for
agriculture and gen-set applications in
India. Diesel and neat biodiesels of
simarouba, rubber seed (non-edible oils)
and rice bran (edibleoil) were used for
conducting tests at varying load conditions
(0, 25%, 50%, 75% and 100%). The
performance (brakethermal efficiency,
brake specific fuel consumption), exhaust
emissions (CO, HC and smoke opacity) and
combustionresults(cylinderpressureriseandh
eatreleaserate)wereanalyzedandcomparedwi
thdieseloperation.Theperformance of
engine was dropped, peak cylinder pressure
rise and heat release rate were reduced as
compared toconventional diesel. On the
other hand the engine showed significant
reductions of exhaust emissions(except
NOx)while running with neat biodiesels.
The combustion studies revealed that the
ignition delay was shorter for
biodieselstested compared to diesel and was
increasing with the load. The neat
simarouba biodiesel was proved to be
bettersubstitute to diesel as it significantly
reduced harmful exhaust emissions, showed
better performance and
combustioncharacteristicscomparedtoother
twobiodiesels tested.

Keywords